Horses grab hold of something, like a fence post, or a rail, part of a stable, telescope, or an EQ6 with their teeth, pull their necks backwards and swallow air.
It's a nervous habit perhaps bought on by boredom. Horses can loose condition, they would rather "windsuck" than graze
Some horses wander around looking for something to suck on plays havoc with the paddock infrastructure, also most astro gear.
Electric fences help.
Shooting the horse is probably a bit extreme but works
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